test(check): add follow-up vp check after vp check --fix in lint warn snap test

Verify that a plain `vp check` also exits with code 0 when only
warnings are present, matching the --fix behavior.

Author: fengmk2

packages/cli/snap-tests/check-fix-lint-warn/snap.txt

@@ -11,3 +11,17 @@ warn: Lint warnings found
 
 Found 0 errors and 1 warning in 1 file (<variable>ms, <variable> threads)
 pass: Formatting completed for checked files (<variable>ms)
+
+> vp check
+pass: All 4 files are correctly formatted (<variable>ms, <variable> threads)
+warn: Lint warnings found
+⚠ eslint(no-console): Unexpected console statement.
+   ╭─[src/index.js:2:3]
+ 1 │ function hello() {
+ 2 │   console.log("hello");
+   ·   ───────────
+ 3 │ }
+   ╰────
+  help: Delete this console statement.
+
+Found 0 errors and 1 warning in 1 file (<variable>ms, <variable> threads)

packages/cli/snap-tests/check-fix-lint-warn/steps.json

@@ -2,5 +2,5 @@
   "env": {
     "VITE_DISABLE_AUTO_INSTALL": "1"
   },
-  "commands": ["vp check --fix"]
+  "commands": ["vp check --fix", "vp check"]
 }